On Fri, Nov 4, 2011 at 10:01 AM, Tim Chase <python.l...@tim.thechases.com> wrote: > list1 = list(d.iterkeys()) > list2 = list(d.iterkeys()) > assert list1 == list2 >
There is such a guarantee in Python 2. From http://docs.python.org/library/stdtypes.html: "If items(), keys(), values(), iteritems(), iterkeys(), and itervalues() are called with no intervening modifications to the dictionary, the lists will directly correspond. This allows the creation of (value, key) pairs using zip(): pairs = zip(d.values(), d.keys()). The same relationship holds for the iterkeys() and itervalues() methods: pairs = zip(d.itervalues(), d.iterkeys()) provides the same value for pairs. Another way to create the same list is pairs = [(v, k) for (k, v) in d.iteritems()]." Python 3 does things quite differently (with views), and I can't find a corresponding promise, but I expect that this would still be the case. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
